# parentheses

Use parentheses as appropriate for explanatory material in text and as shown in the examples that follow.

**1. Parentheses in Equations**

In equations, use parentheses, brackets, and braces in this sequence (which may be repeated as needed).

**2. Parentheses with Measurements**

Use parentheses around English measurements that follow SI (metric) measurements.

**3. Parentheses in Citations**

When you use parentheses in text, such as for author-date references or for parenthetical (added) information, place a comma after the parentheses rather than before them.

**4. Nested Parentheses in Text**

In body copy, use parentheses, brackets, and braces in this sequence, which may be repeated as needed: ([{ }]).

**Subject:**

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